Abstract
The low field ( H a.c. ⋍ 0.05 Oe) and low frequency (15 Hz) a.c. susceptibility has been measured for the amorphous alloys RE 40Y 23Cu 37, with RE = Gd, Tb, Dy, Ho, and Er. The susceptibility exhibits a cusp, characteristic of a spin-glass phase transition from paramagnetic state. Gd 40Y 23Cu 37 seems to exhibit a mixed ferromagnetic-spin glass phase below 62.5 K. Using the Sherrington-Kirkpatrick mean field theory, we have determined, from the observed cusps, the temperature dependence of the Edwards-Anderson spin glass order parameter, the dependence, consistent with theory, being in the form q( T) = A( T SG − T) β , with β ⋍ 1.
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